Version 1.22 causes the editor in the "Markup / HTML" field of a SearchAction to remain empty after selecting a message template unless "enable plain text" is checked

I haven't been able to take a closer look at what's happening yet, but want to share. There were no error messages in the CiviCRM log or the PHP log.

To reproduce it, you simply have to build an action with the "Search Action Designer" that contains a "Markup / HTML" field. This must be configured with "enable template" is checked. If this action is now used from a search and a message template is selected from the dropdown, the editor field remains empty, but should display the template (or the code) here.

If the new checkbox "Enable Plain Text" is selected additionally, everything works.