Tried to add a new taxonomy, this worked, I think, but I can't view it in the admin area or list terms of other taxonomies.
Here are the errors from reports.
Notice: Undefined index: value in Drupal\taxonomy\TermStorage->getTermIdsWithPendingRevisions() (line 381 of /home/feafccef/public_html/live/outdoorfood.club/core/modules/taxonomy/src/TermStorage.php) #0 /home/feafccef/public_html/live/outdoorfood.club/core/includes/bootstrap.inc(587): _drupal_error_handler_real(8, 'Undefined index...', '/home/feafccef/...', 381, Array) #1 /home/feafccef/public_html/live/outdoorfood.club/core/modules/taxonomy/src/TermStorage.php(381): _drupal_error_handler(8, 'Undefined index...', '/home/feafccef/...', 381, Array) #2 /home/feafccef/public_html/live/outdoorfood.club/core/modules/taxonomy/src/Form/OverviewTerms.php(291): Drupal\taxonomy\TermStorage->getTermIdsWithPendingRevisions() #3 [internal function]: Drupal\taxonomy\Form\OverviewTerms->buildForm(Array, Object(Drupal\Core\Form\FormState), Object(Drupal\taxonomy\Entity\Vocabulary)) #4 /home/feafccef/public_html/live/outdoorfood.club/core/lib/Drupal/Core/Form/FormBuilder.php(519): call_user_func_array(Array, Array) #5 /home/feafccef/public_html/live/outdoorfood.club/core/lib/Drupal/Core/Form/FormBuilder.php(276): Drupal\Core\Form\FormBuilder->retrieveForm('taxonomy_overvi...', Object(Drupal\Core\Form\FormState)) #6 /home/feafccef/public_html/live/outdoorfood.club/core/lib/Drupal/Core/Controller/FormController.php(93): Drupal\Core\Form\FormBuilder->buildForm('taxonomy_overvi...', Object(Drupal\Core\Form\FormState)) #7 [internal function]: Drupal\Core\Controller\FormController->getContentResult(Object(Symfony\Component\HttpFoundation\Request), Object(Drupal\Core\Routing\RouteMatch)) #8 /home/feafccef/public_html/live/outdoorfood.club/core/lib/Drupal/Core/EventSubscriber/EarlyRenderingControllerWrapperSubscriber.php(123): call_user_func_array(Array, Array) #9 /home/feafccef/public_html/live/outdoorfood.club/core/lib/Drupal/Core/Render/Renderer.php(582): Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() #10 /home/feafccef/public_html/live/outdoorfood.club/core/lib/Drupal/Core/EventSubscriber/EarlyRenderingControllerWrapperSubscriber.php(124): Drupal\Core\Render\Renderer->executeInRenderContext(Object(Drupal\Core\Render\RenderContext), Object(Closure)) #11 /home/feafccef/public_html/live/outdoorfood.club/core/lib/Drupal/Core/EventSubscriber/EarlyRenderingControllerWrapperSubscriber.php(97): Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->wrapControllerExecutionInRenderContext(Array, Array) #12 /home/feafccef/public_html/live/outdoorfood.club/vendor/symfony/http-kernel/HttpKernel.php(151): Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() #13 /home/feafccef/public_html/live/outdoorfood.club/vendor/symfony/http-kernel/HttpKernel.php(68): Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object(Symfony\Component\HttpFoundation\Request), 1) #14 /home/feafccef/public_html/live/outdoorfood.club/core/lib/Drupal/Core/StackMiddleware/Session.php(57): Symfony\Component\HttpKernel\HttpKernel->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #15 /home/feafccef/public_html/live/outdoorfood.club/core/lib/Drupal/Core/StackMiddleware/KernelPreHandle.php(47): Drupal\Core\StackMiddleware\Session->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #16 /home/feafccef/public_html/live/outdoorfood.club/core/modules/page_cache/src/StackMiddleware/PageCache.php(106): Drupal\Core\StackMiddleware\KernelPreHandle->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #17 /home/feafccef/public_html/live/outdoorfood.club/core/modules/page_cache/src/StackMiddleware/PageCache.php(85): Drupal\page_cache\StackMiddleware\PageCache->pass(Object(Symfony\Component\HttpFoundation\Request), 1, true) #18 /home/feafccef/public_html/live/outdoorfood.club/core/lib/Drupal/Core/StackMiddleware/ReverseProxyMiddleware.php(47): Drupal\page_cache\StackMiddleware\PageCache->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #19 /home/feafccef/public_html/live/outdoorfood.club/core/lib/Drupal/Core/StackMiddleware/NegotiationMiddleware.php(52): Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #20 /home/feafccef/public_html/live/outdoorfood.club/vendor/stack/builder/src/Stack/StackedHttpKernel.php(23): Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #21 /home/feafccef/public_html/live/outdoorfood.club/core/lib/Drupal/Core/DrupalKernel.php(693): Stack\StackedHttpKernel->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #22 /home/feafccef/public_html/live/outdoorfood.club/index.php(19): Drupal\Core\DrupalKernel->handle(Object(Symfony\Component\HttpFoundation\Request)) #23 {main}.
Drupal\Core\Database\DatabaseExceptionWrapper: SQLSTATE[42000]: Syntax error or access violation: 1064 You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near ') AS expression FROM drup_ tfr INNER JOIN drup_ tr ON tfr. = tr. AND tr. = 0 INN' at line 1: SELECT tfr.tid AS tid, MAX(tfr.) AS expression FROM {} tfr INNER JOIN {} tr ON tfr. = tr. AND tr. = 0 INNER JOIN (SELECT t.tid AS tid, t.langcode AS langcode, MAX(t.) AS expression FROM {} t WHERE t. = :db_condition_placeholder_0 GROUP BY t.tid, t.langcode) mr ON tfr. = mr. AND tfr.langcode = mr.langcode GROUP BY tfr.tid; Array ( [:db_condition_placeholder_0] => 1 ) in Drupal\taxonomy\TermStorage->getTermIdsWithPendingRevisions() (line 404 of /home/feafccef/public_html/live/outdoorfood.club/core/modules/taxonomy/src/TermStorage.php).
I haven't had any issues with adding new taxonomies or editing old ones until updating to 8.7.
I have other issues occuring when updating core and content showing page not found but finding no fixes for them.