Draw effects units setting doesn't persist

[Houska1]

(Vector, line) Symbology / Simple Line / Draw effects / Inner or outer glow unit selection for blur radius doesn't persist.

Example - create an outer glow for the line, set the spread to ... pixels and blur radius to ... pixels. This means changing the units for each from mm to pixels.

Click OK to leave draw effects. Reopen draw effects. The blur radius units are back to mm.

Also happens for inner glow but not for drop shadow. Haven't tested the rest, nor have I investigated whether the blur radius is actually rendered as pixels or mm (it's a subtle setting...).

[Houska1]

Also happens if you choose the blur radius units to something else (e.g. inches), not just pixels. Using 3.10.2 code revision d4cd3cfe5a (latest full not dev OSGeo4W release).