Custom placeholder does not work with custom block.

[hsingh-ds]

Describe the bug
I have tried custom placeholder feature. It is working for inbuilt blocks like paragraph and heading. But it does not work with custom blocks.

To Reproduce
Check the example show in the documentation.

Misc

• Blocknote version: 0.19.2

[GersonDantas]

I tell you how I managed to solve it, here in this ISSUE

#754

[YousefED]

duplicate of #754