Insertion markers aren't getting removed from the block count when they are hidden

[BeksOmega]

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Description

It seems insertion markers aren't being properly disposed of.

Reproduction steps

1. Add two blocks to the workspace that can connect
2. Bring them near each other and apart again so you show and hide a bunch of insertion markers.
3. Right click on the workspace, observe how it says "delete X blocks" where X is much larger than 2.

That number will go up if you preview more insertion markers.

Stack trace

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