Including a single special character changes the font of the entire message

The issue

When writing a message, the presence of a single character not supported by Bedrock's font results in the entire message changing font.

Examples

Since the unicode font is very hard to read (MCPE-15191), this presents an accessibility issue.

Expected behavior

Only the unsupported character should change; the rest of the message should use the correct font.

How to reproduce

Type any normal english message into chat.

Now paste in this character: 胧

Observed result: the entire message swapped to the unicode font

Expected result: only the pasted character should use the unicode font