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Modify Path > interpolate attribute in a group has unexpected output

Steps to reproduce:

  • Open Inkscape
  • Create 12 (no more or less) shapes is a row
  • Group them all
  • Go to Extension > Modify Path > Interpolate attribute in a group
  • Set the Attribute to Interpolate to Fill
  • Set the Start value to #581845
  • Set the End value to #c70039
  • Set the Unit (bottom option) to Fill
  • Select the group and hit apply

What happened?

Last few shapes have greeny-yellow color instead of ending at #c70039

Note that 13 shapes don't have this problem

before after
inkscape_interpolate_before.svg inkscape_interpolate_after.svg

Inkscape Version and Operating System:

Inkscape 1.1-dev (2fde448245, 2020-02-25) debug build with extensions at a157d464 and master (af5f866473e8338139e215268b8043ab233412dd) at Linux Mint 19.1
Light testing shows present in Inkscape-2019-05-18-f30e5cd but not in 1.0alpha (4a6046a, 2019-03-18) and extensions somewhere between f9f35999e8fc9dc701034d3026bf2c6625bc65bb and f26155de5af6780e614d491241449e5325efad75

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