Incorrect swimming interval time and pace

I just tried to analyze a swim session on intervals.icu and noticed that the time per interval as well as the pace are off. For example, Garmin Connect says that the first interval took 1:33.4. Strava agrees with this, but intervals.icu claims it took 1:36. This is the interval duration, not the pace, which is wrong in the same way. Intervals.icu lists the same incorrect time on the top graph and the tabular list of intervals.
This is not a duplicate of the other thread about incorrect swim intervals as that one referred to incorrect distance when using yards.

There are some outstanding issues with pool swims and pace I need to figure out. Basically Intervals.icu takes the lengths and generates streams from that so all the analytics work out. Sometimes the lengths “overlap” etc. which is what I need to figure out what to do with.

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Sorry, in the meantime I realized this matter was already reported in that thread