Certain emoji disables the reply function

[autotunafish]

Describe the bug
A utf-8 shield icon 🛡 of the hex sequence f09f9ba1 placed anywhere in the memo will disable the reply function.

To Reproduce
1 Create a transaction in any shielded wallet with a memo containing only a return address in a suitable location. The Regex splits at /[ :\n\r\t]+/ and the address may be the only text present.
2 Place a shield icon containing the hex code above anywhere in the memo that it would not otherwise affect the Regex match and address verification.
3 Send to a Zecwallet Lite desktop and attempt the reply button.

Expected behavior
The Regex matches in the same manner as using the "Reply-To" or any other non-regex-matchable prefix that satisifies. The icon at the beginning, followed by a newline, followed by the addy should work.

Desktop (please complete the following information):

• OS: Windows 11
• Browser: chrome (not-applicable)
• Version: 1.8.8

Additional context
It also appears that memo prefixes of certain lengths also disable the reply function. For example 😄MSG(newline) doesn't work (16 hex chars f09f98804d53470a) but 😄MS(newline) does (14 hex chars f09f98804d530a).