Enabling metadata updater used by hot-reload causes the runtime and libraries to take codepaths conditionalized by MetadataUpdater.IsSupported property. These codepaths receive less thorough testing and have higher risk of containing bugs. #78218 has been an example of such bug.

Metadata updater is automatically enabled when managed debugger is attached and there is no way to suppress it:

We should add a config switch that unconditionally disables metadata updater and that can be used as a workaround for bugs in hot-reload specific codepaths.

Context: #78218 (comment)