In version 1.20.1-1.5.295, when building a 3-block-wide portal (inner dimensions), using the charred bone on the top surface of the middle block in the bottom row does not activate the portal. However, clocking the top surface of either of the other two blocks on the bottom row works as expected.

See the image attached for reference regarding which surface the bug affects

Can confirm this as a bug, and that it affects all portal sizes, as apparently only the bottom left and bottom right corners are able to create the portal.

See here: https://github.com/Tamaized/Voidscape/assets/144502047/f5b2918e-47f2-479d-9c84-82ad68914168

To clarify, this is a bug in v1.5.305.