Tab rendering freeze after switching window through stage manager

[marknelissen]

Description

This happens when having multiple windows open, each within a different profile. When switching from the window in one profile to the window in another profile through macOS stage manager, the now active window is partially frozen. The tab selector is interactive, and you can change tabs, but the content of the tab does not render. On the initial tab that was active you see a frozen image of the tab content, but when switching tabs, the other tabs are all blank. This effect remains several seconds, after which the tab content renders and becomes interactive again.
This only happens under these exact circumstances: different profile and switching through stage manager. When switching through e.g. mission control, the new window is immediately interactive. Same when both windows belong to the same profile. This also does not happen when coming from another app, only if coming from another Brave window in a different profile.

Steps to reproduce

1. Open window in a profile
2. Open new window in another profile
3. Switch from window 2 to window 1 through stage manager (macos)

Actual result

You can switch tabs, but tabs remain blank and/or non-interactive. This remains several seconds so.

Expected result

Same as when both windows belong to the same profile, or if you switch through some other means: the first window is immediately usable.

Reproduces how often

Easily reproduced

Brave version (brave://version info)

Brave | 1.78.102 Chromium: 136.0.7103.113 (Officiële build) (arm64)
Revisie | 9161158db1676f5fb4a6e048cc98d776dcbf9bad
Besturingssysteem | macOS Versie 15.5 (build 24F74)

Channel information

• release (stable)
• beta
• nightly

Reproducibility

• with Brave Shields disabled
• with Brave Rewards disabled
• in the latest version of Chrome

Miscellaneous information

No response

[marknelissen]

Additional observation: the delay seems to be affected by the quality of the internet connection speed.