The Bulma dependency on ui_icons_font and ui_styles_block seemed to force an upgrade to Drupal 11, although i cannot be certain after six hours of upgrading various things to get to Drupal 11.
Anyway, at the end of all that i'm getting this:
Drupal\Core\Render\Component\Exception\InvalidComponentException: The component "bulma:button" uses non-string types for properties: url, icon_left, icon_right. in Drupal\Core\Theme\Component\ComponentValidator->validateDefinition() (line 99 of core/lib/Drupal/Core/Theme/Component/ComponentValidator.php).
Drupal\Core\Theme\ComponentPluginManager->isValidDefinition() (Line: 270)
Drupal\Core\Theme\ComponentPluginManager->Drupal\Core\Theme\{closure}() (Line: 43)
Drupal\Component\Assertion\Inspector::assertAll() (Line: 269)
Drupal\Core\Theme\ComponentPluginManager->alterDefinitions() (Line: 344)
Drupal\Core\Plugin\DefaultPluginManager->findDefinitions() (Line: 216)
Drupal\Core\Plugin\DefaultPluginManager->getDefinitions() (Line: 154)
Drupal\Core\Theme\ComponentPluginManager->getAllComponents() (Line: 487)
Drupal\Core\Asset\LibraryDiscoveryParser->librariesForComponents() (Line: 408)
Drupal\Core\Asset\LibraryDiscoveryParser->parseLibraryInfo() (Line: 153)
Drupal\Core\Asset\LibraryDiscoveryParser->buildByExtension() (Line: 87)
Drupal\Core\Asset\LibraryDiscoveryCollector->getLibraryDefinitions() (Line: 66)
Drupal\Core\Asset\LibraryDiscoveryCollector->resolveCacheMiss() (Line: 149)
Drupal\Core\Cache\CacheCollector->get() (Line: 166)
Drupal\Core\Asset\LibraryDiscoveryCollector->getLibrariesByExtension() (Line: 173)
Drupal\Core\Asset\LibraryDiscoveryCollector->getLibraryByName() (Line: 68)
Drupal\Core\Asset\LibraryDependencyResolver->doGetDependencies() (Line: 70)
Drupal\Core\Asset\LibraryDependencyResolver->doGetDependencies() (Line: 41)
Drupal\Core\Asset\LibraryDependencyResolver->getLibrariesWithDependencies() (Line: 132)
Drupal\Core\Asset\AssetResolver->getLibrariesToLoad() (Line: 191)
Drupal\Core\Asset\AssetResolver->getCssAssets() (Line: 288)
Drupal\Core\Render\HtmlResponseAttachmentsProcessor->processAssetLibraries() (Line: 132)
Drupal\Core\Render\HtmlResponseAttachmentsProcessor->processAttachments() (Line: 97)
Drupal\big_pipe\Render\BigPipeResponseAttachmentsProcessor->processAttachments() (Line: 45)
Drupal\Core\EventSubscriber\HtmlResponseSubscriber->onRespond() (Line: 246)
Symfony\Component\EventDispatcher\EventDispatcher::Symfony\Component\EventDispatcher\{closure}() (Line: 206)
Symfony\Component\EventDispatcher\EventDispatcher->callListeners() (Line: 56)
Symfony\Component\EventDispatcher\EventDispatcher->dispatch() (Line: 216)
Symfony\Component\HttpKernel\HttpKernel->filterResponse() (Line: 204)
Symfony\Component\HttpKernel\HttpKernel->handleRaw() (Line: 76)
Symfony\Component\HttpKernel\HttpKernel->handle() (Line: 54)
Drupal\simple_oauth\HttpMiddleware\BasicAuthSwap->handle() (Line: 53)
Drupal\Core\StackMiddleware\Session->handle() (Line: 48)
Drupal\Core\StackMiddleware\KernelPreHandle->handle() (Line: 28)
Drupal\Core\StackMiddleware\ContentLength->handle() (Line: 32)
Drupal\big_pipe\StackMiddleware\ContentLength->handle() (Line: 116)
Drupal\page_cache\StackMiddleware\PageCache->pass() (Line: 90)
Drupal\page_cache\StackMiddleware\PageCache->handle() (Line: 48)
Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle() (Line: 51)
Drupal\Core\StackMiddleware\NegotiationMiddleware->handle() (Line: 53)
Drupal\Core\StackMiddleware\AjaxPageState->handle() (Line: 51)
Drupal\Core\StackMiddleware\StackedHttpKernel->handle() (Line: 715)
Drupal\Core\DrupalKernel->handle() (Line: 19)
Active
4.0
Code
Found 📌 Unhelpful PHP error with NULL type property Needs review while looking for similar issues and realized that my Drupal 11 was not up to date; a bizarre interaction with Drupal lenient plugin and a patch had left it at a release candidate. Completing the upgrade to Drupal 11.2 resolved this problem.