When you type "/help a" in the Chatbar the chatbar reset to "a". When you type in any other letter it doesn't reset.
Edit by @unknown:
Example Steps to Reproduce:
Start the game in 1.2.6.2 Retail and open a world
Open the chat bar
Press CTRL+Esc (focus moves from Minecraft)
Click focus back on Minecraft
Type some text or a command in the chat bar or inventory search
Linked issues
is duplicated by 9
relates to 1
Attachments
Comments 5
This may be related to MCPE-30151, which describes what seem to be issues around the game failing to notice when a pressed key is released. One of the duplicates of this ticket, MCPE-29762, mentions that in addition to this "A" key problem, pressing the "V" key (without holding down CTRL) pasted text. That suggests that the game thinks CTRL is still being pressed when it isn't. Similarly, CTRL+A is the keyboard equivalent of Select All. If the game thinks CTRL is pressed when it reads the A key, it will select the entire input text, and then if a character-generating key is pressed next it will delete the input text and replace it with that character, which is much like the problem being reported here. In short, there could be a common root cause that keyboard break codes are being lost or are not being processed correctly.
I can't seem to reproduce this reliably - do you have any more information about triggering this issue?