[BUG] Unity gizmos not being drawn when custom render pass "RenderImGuiPass" is enabled... sometimes.

[CaptainTimberTim]

Hi,

I have a strange bug that sometimes in specific scenes the unity gizmos won't be drawn in play modus.
I figured out that it only happens when the Custom Pass Volume with the RenderImGuiPass is enabled and drawing a window.
As soon as I disable it, the unity gizmos reappear.
Pass enabled:

Pass disabled:

As this happens only randomly, in some scenes, it seems to be something unity changes sometimes, like the script execution order. But I have no idea how it actually happens.

I currently use Unity 2021.2.11 (but it happened in earlier versions as well)
and the latest version of this Imgui package.