## Summary of the Pull Request
Make sure to set the scancode for the manual alt-up's we're sending. If you don't, then terminalInput in the conpty is going to treat that keypress as an actual NUL, and send that to the connected client.
## References
* regressed in #6421
## PR Checklist
* [x] Closes#6513
* [x] I work here
* [ ] Tests added/passed
* [n/a] Requires documentation to be updated
## Validation Steps Performed
Tested `showkeys -a`
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