Question: Repeatable Kernel crash using 2D-math but not maple notation

(Context: As part of a EU consumer watchdog report I've been asked to re-validate a number of publically stated APR rates for various consumer loan. )

(Apologize if this should have been posted to some bug-tracker but I was unable to find such a forum.)

System: MacOS 10.14.6, Maple 2020.1

Summary: Some simple exponential summations entered in 2D Input seems to crash the kernel and it is dependent on the numerical value of the exponent. The same expressions entered in 1D plaintext Maple Notation works fine. The numerically/expression evaluations are also significantly slower in 2D Input in a Document (x10) as compared to 1D Maple Notation in a Worksheet.

The attached worksheet is a "killer" worksheet and will on OSX 10.14.6 + Maple 2020.1 kill the kernel connection (crash the kernel).

kernel-crash.mw

Example:

A trivial example, entering 2D Math (assume PV & C are positive real numbers), say

will cause a lost connection to the kernel after 40-50s entering the epression and the UI being busy (unclear what it is doing since no real calculation is performed) which I assume is a sign that the kernel crashed. It seems to dependent on the exponent in the divisor. So for example the following variation will not crash the kernel

Doing the exact same calculation with a worksheet in old plain maple notation both varianta are both significantly faster in the numerical operation (solving for 'r') and assigning 'eq2' and never crashes (regardless of numerical value of exponent).

The workaround is of course obvious but it would be nice if this bug could be adressed.

It seems that whenever I try to give the 2D-UI a chance (since it is actally easier to visually view complex expressions)  something always comes back and bites me...

Update: The crash is only repeatable with the "sum()" command and not the "add()" command.