New
See
https://www.geogebra.org/m/ehatgfue
(local Apps 5.x, 6.x)
r (min-command) is set to the shortest distance to planes z=0 or z=1
set slider k=0.65
Online Version seems not to min distance - please try
but comming back over night the online version has come back to bussines and is working fine.
after reloading app the problem coming back
The same problem 
r=Min({sqrt((M-Intersect(g,z=0))^(2)), sqrt((M-Intersect(g,z=a))^(2))})Try splitting that up into smaller "chunks"
Also Distance() command might be useful?
A workaround was to put it in a if-clause...
but curios that only the online app is affected.
BTW: just now found
I think the reason of this inconsistency is intercept(ion) with plane z=0 return a R^2 point instead of R^3 point...
I do not use intersept command - compute a CAS formula
Makes sense, you can do
to convert if necessary
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