Autocomplete fails when attempting to @mention multiple people in a DM regardless of cursor position

[KE8UPE]

Problem summary

When attempting to send a direct message to someone I met in the Github class BITS recently concluded), I tried to @mention "bits" in the message. I followed the instructions given, which said to place my cursor at the beginning of the username, immediately before the @ sign. However, the autocomplete feature fails to provide @mention suggestions regardless of where the cursor is positioned.

Steps to reproduce

1. Open a DM with another user in FastSM.
2. Attempt to @mention "bits" by typing @bits
3. Place cursor at the beginning of the username (prior to the @ sign) as instructed or at the end.
4. Observe that autocomplete does not provide suggestions either way.

Expected

Autocomplete should work for @mentions whether the cursor is before or after the @ sign, or at least as instructed by the interface.

Actual

Autocomplete fails to activate, and no suggestion is provided.

Additional context

• The DM was sent to another user from the Github class after class concluded.
• The instructions shown were followed precisely.
• The issue persists regardless of cursor position

[masonasons]

I believe I may have fixed this.