Calling module with command bar and hovering over datatypes/libraries in debugger crashes Studio

[nothing_1649 (gom_a)]

If a module is called with the command bar and breaks into the debugger, hovering over datatypes or libraries such as Instance or the task library will cause a crash to desktop.
I found this bug about an hour ago and it makes debugging far more difficult and crash-prone.

Repro, place file and crash dump

Every datatype and library I’ve tried has caused crashes (CFrame, coroutine, TweenInfo, string etc).
The following place file contains a module in ReplicatedStorage to easily test it out, instructions are in the module and as follows:

1. Get this place file:
   breakpointCrashTest.rbxl (44.9 KB)
2. Open the module placed in ReplicatedStorage named “BreakpointThisScript”
3. Place a breakpoint at line 7 (other lines may work but I tested with 7)
4. Run the following script through the command bar (edit/run mode doesn’t matter):

local r = require(game.ReplicatedStorage.BreakpointThisScript) r.testCrash()

5. Hover over any libraries or datatypes in the script, studio should crash to desktop

Video

The module (placed in ReplicatedStorage)

local module = {}

--call following function with this code:
--local r = require(game.ReplicatedStorage.BreakpointThisScript) r.testCrash()

function module.testCrash()
	--this will only crash when executed through cmd bar
	--during breakpoint, hover over any library or datatype in print
	--place breakpoint on following line
	print('breakpoint not placed', task, Instance)
	--also crashes when using methods of said objects
	print(task.wait(), Instance.new('Part'))
end
--and also with things outside of the function's scope
print(task, Instance)
--and both too
print(task.wait(), Instance.new('Part'))

return module

Crash dump

https://devforum.roblox.com/t/debugger-cmdbar-crash-dump/2700621

[WheretIB]

Thank you for the report.
We have a fix for this issue internally and it should be released in one of the earliest updates next year.

[IISato (Sato)]

I’m getting this crash to desktop whenever just exiting PlayTest in general, and moving my mouse towards open scripts.