NME get error when trying to drag a block from pbrmetallicroughnessblock

[tanpopo]

Steps:

1. Create a pbrmetallicroughnessblock;
2. Create a block by dragging from the input ‘reflection’

And it get error.
The last six inputs of pbrmetallicroughnessblock all unable to drag a block out.

[Cedric]

ping @Deltakosh

[Deltakosh]

On it!

[Deltakosh]

Here we are:
Fix some additional issues by deltakosh · Pull Request #12708 · BabylonJS/Babylon.js (github.com)