Canvas and Long Canvas turn black when a Full Block is placed above them

[avilonlegends]

Hi there!

Issue is as stated in the title. This only occurs with the canvas sizes "Canvas" and "Long Canvas".
Example screenshots below.

I'm playing on Fabric 1.21.1, mod version 1.1.0.
This was tested on a minimal instance.

This issue did not occur with the previous mod version (1.0.0).