Needless 'No conflicts to resolve' dialog

[pinkduck]

I have the following two preferences set in JOSM:

org.openstreetmap.josm.gui.conflict.tags.TagConflictResolver.showTagsWithConflictsOnly=true
org.openstreetmap.josm.gui.conflict.tags.TagConflictResolver.showTagsWithMultiValuesOnly=true

See the attached Demonstration.osm file for a particular arrangement where trying to combine three ways into a closed way building shape results in a dialogue stating 'No conflicts to resolve'.

Way 1: building=yes
Way 2: building=yes
Way 3: untagged

I do not believe the 'No conflicts to resolve' dialogue should be shown in this case. If the separate ways with building=yes are combined first and then combined with the remaining untagged way the dialogue is not shown, so what is special about the 3-way case?

It is quite a nuisance to have to dismiss this dialogue hundreds of times when splitting and rejoining building outlines into individual addresses.

[pinkduck]

Simple test case to demonstrate issue