Did the patch fix the error for you ? The error is in CampaignMonitorSubscriptionManager, line 139, but the patch touches the CampaignMonitorManager file.
I'm still experiencing the error after the patch.
Notice: Trying to access array offset on value of type bool in Drupal\campaignmonitor\CampaignMonitorSubscriptionManager->singleSubscribeForm() (line 139 of modules/contrib/campaignmonitor/src/CampaignMonitorSubscriptionManager.php).
Drupal\campaignmonitor\CampaignMonitorSubscriptionManager->singleSubscribeForm(Array, 'anon@anon.com') (Line: 185)
Drupal\campaignmonitor\Form\CampaignMonitorSubscribeForm->singleSubscribeForm(Array, 'anon@anon.com') (Line: 158)
Drupal\campaignmonitor\Form\CampaignMonitorSubscribeForm->buildForm(Array, Object, Array)
call_user_func_array(Array, Array) (Line: 532)
Drupal\Core\Form\FormBuilder->retrieveForm('campaignmonitor_subscribe_form', Object) (Line: 278)
Drupal\Core\Form\FormBuilder->buildForm('\Drupal\campaignmonitor\Form\CampaignMonitorSubscribeForm', Object) (Line: 219)
Drupal\Core\Form\FormBuilder->getForm('\Drupal\campaignmonitor\Form\CampaignMonitorSubscribeForm', Array) (Line: 160)
Drupal\campaignmonitor\Plugin\Block\CampaignMonitorSubscribeBlock->build() (Line: 171)
Drupal\block\BlockViewBuilder::preRender(Array)
call_user_func_array(Array, Array) (Line: 100)
Drupal\Core\Render\Renderer->doTrustedCallback(Array, Array, 'Render #pre_render callbacks must be methods of a class that implements \Drupal\Core\Security\TrustedCallbackInterface or be an anonymous function. The callback was %s. Support for this callback implementation is deprecated in 8.8.0 and will be removed in Drupal 9.0.0. See
https://www.drupal.org/node/2966725 →
', 'silenced_deprecation', 'Drupal\Core\Render\Element\RenderCallbackInterface') (Line: 781)
Drupal\Core\Render\Renderer->doCallback('#pre_render', Array, Array) (Line: 372)
Drupal\Core\Render\Renderer->doRender(Array, 1) (Line: 200)
Drupal\Core\Render\Renderer->render(Array, 1) (Line: 156)
Drupal\Core\Render\Renderer->Drupal\Core\Render\{closure}() (Line: 573)
Drupal\Core\Render\Renderer->executeInRenderContext(Object, Object) (Line: 157)
Drupal\Core\Render\Renderer->renderPlain(Array) (Line: 171)
Drupal\Core\Render\Renderer->renderPlaceholder('callback=Drupal%5Cblock%5CBlockViewBuilder%3A%3AlazyBuilder&args%5B0%5D=campaign_monitor_subscribe_block&args%5B1%5D=full&args%5B2%5D&token=cNFeZ-WbZ1OYWHtcGKKnL3rhBR2BvK8G1wnAqd-erXg', Array) (Line: 693)
Drupal\big_pipe\Render\BigPipe->renderPlaceholder('callback=Drupal%5Cblock%5CBlockViewBuilder%3A%3AlazyBuilder&args%5B0%5D=campaign_monitor_subscribe_block&args%5B1%5D=full&args%5B2%5D&token=cNFeZ-WbZ1OYWHtcGKKnL3rhBR2BvK8G1wnAqd-erXg', Array) (Line: 547)
Drupal\big_pipe\Render\BigPipe->sendPlaceholders(Array, Array, Object) (Line: 305)
Drupal\big_pipe\Render\BigPipe->sendContent(Object) (Line: 112)
Drupal\big_pipe\Render\BigPipeResponse->sendContent() (Line: 374)
Symfony\Component\HttpFoundation\Response->send() (Line: 20)
Notice: Trying to access array offset on value of type bool in Drupal\campaignmonitor\CampaignMonitorSubscriptionManager->singleSubscribeForm() (line 145 of modules/contrib/campaignmonitor/src/CampaignMonitorSubscriptionManager.php).
Drupal\campaignmonitor\CampaignMonitorSubscriptionManager->singleSubscribeForm(Array, 'anon@anon.com') (Line: 185)
Drupal\campaignmonitor\Form\CampaignMonitorSubscribeForm->singleSubscribeForm(Array, 'anon@anon.com') (Line: 158)
Drupal\campaignmonitor\Form\CampaignMonitorSubscribeForm->buildForm(Array, Object, Array)
call_user_func_array(Array, Array) (Line: 532)
Drupal\Core\Form\FormBuilder->retrieveForm('campaignmonitor_subscribe_form', Object) (Line: 278)
...
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Did the patch fix the error for you ? The error is in CampaignMonitorSubscriptionManager, line 139, but the patch touches the CampaignMonitorManager file.
I'm still experiencing the error after the patch.