This seems to be a very common source of bugs when using the Hero API:

• Heroes don't handle inherited properties #213
• Hero wrapping a widget that require Material widget ancestor #34119
• Text in Hero red when animating #30647
• Text in Hero glitches during transition #12463

and in the framework:

• Unable to Change TextSelectionHandleColor using Theme Widget #34640
• Hero inserts widgets After Dispose #35555 (not really in the same category but somewhat related)

Workaround

As a temporary workaround, manually wrap whatever is missing inside the hero, or in its shuttleBuilder.
See: #30647 (comment)

additional context:
#6072 (comment)