We tried to repro the issue in MS Teams Desktop client and web client and it's working fine for us. Not able to see any red block.
Microsoft Teams Version 1.5.00.19574 (64-bit). It was last updated on 7/28/2022.
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In MS Teams Bot Adapter App,
The button are showing up with red square blocks along with labels, inside the chat flow and same issue are also present for other Bot apps.
The issue have occurred some days ago, earlier there were no red squared blocks present for buttons.
Attaching the screenshot below.
We tried to repro the issue in MS Teams Desktop client and web client and it's working fine for us. Not able to see any red block.
Microsoft Teams Version 1.5.00.19574 (64-bit). It was last updated on 7/28/2022.