🐞 Animation artifacts expanding Slack

Bug Description

Whenever I open Slack's app after it's been minimized with Loop running I get blocky animation artifacts of multiple lines with shadows that fill the space of the app until the app fully opens and the app appears. The blocky shadowy lines do not show the app ui at all until it fully expands. If I exit Loop the issue stops. I haven't found any other apps this happens with.

Affected Scope

User interface

Steps to Reproduce

1. Have Loop running.
2. Minimize Slack's desktop app.
3. Click Slack icon in dock to open the app again.
4. Blocky lines with shadows fill the app window space until the app appears.

Reproducibility

Always

Expected vs Actual Behavior

Expect a fluid animation of the Slack app window to expand.

Screen Recordings / Screenshots

Screenshot doesn't capture the effect.

Severity

Minor (limited impact)

macOS Version

Tahoe 26.5.2 (25F84)

Loop Version

1.4.3 (1755)

Did You Try the Development Build?

No

Additional Context

No response

Final Checks

• My issue is written in English.
• My issue title is descriptive.
• This is a single bug (multiple bugs should be reported individually).
• I have looked to see if this is a duplicate of another bug report.
• I can help with further investigation.
• I can help with developing a fix for this issue.

Start by reproducing the issue with Loop 1.4.3 on macOS Tahoe 26.5.2 using the listed Slack minimize-and-reopen steps, then compare the development build since it was not tested. Done means Slack expands without blocky shadowed lines or other animation artifacts while Loop is running.