New
Win10, Geogebra 5.0.640
Sequence(Rotate(stroke1, n * 30°), n, 1, 12)
In algebra view, it show some "null"s, but in older version, it shows "4.03"
In 5.0.640
but in old versions( I captured the screen):
Files:
bug-sequence-of...
The same problem 
the old version is in 2018
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