color legend size changes for screenshots with different size

When saving screenshots that are a different size than the Viewport, the Color Legend is strangely larger. Here is how to replicate:

ParaView 5.6.0, builtin server, Linux.
Sources/ Wavelet. Apply. Surface. RTData.
Save Screenshot. I locked the X and Y, then added say 10% or 20% to the size. Save. Now, compare this to the original. The Color Legend is a lot wider, and the characters are also disproportionately large.

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information