Description

Sitecore forms might not be visible if IsTemplate or Hidden system fields are not included in the search index.
Such a scenario is possible if indexAllFields is set to false or the fields are excluded from indexing explicitly using the configuration section with the list:AddExcludedField hint.

Solution

To resolve the issue, consider the following steps:

1. Download the Sitecore.Support.229445.config file and copy it to the \App_Config\Include\zzz folder.
2. Rebuild the sitecore_master_index.