Cannot load ISIS event data file

[mducle]

Original reporter: ISIS / M. Aouane

Describe the bug

Mantid gives an error:

Error in execution of algorithm LoadEventNexus:
Cannot guess ending value from a TimeSeriesProperty that contains only a single time

when trying to load this particular file:

from mantid.simpleapi import *
Load(Filename='/data/instrument/MARI/CYCLE20241/RB0/MAR29527.n001', OutputWorkspace='MAR29527')

The file should be publicly accessible on the DAaaS system - or I can send directly (it's a bit big so I don't want to attach it to this issue).

To Reproduce

Run the script above

Expected behavior

The file loads without error.

Screenshots

Platform/Version (please complete the following information):

• OS: Rocky 8 Linux
• OS Version:
• Mantid Version: 6.9.1 (also checked on 6.7 and 6.8 which give the same error).

Additional context

The file loads fine with nexpy and hdfview so is a valid NeXus file. The error seems to be in the RoI (region of interest) processing in LoadEventNexus which in turn calls TimeROI::replaceROI which gives the error, but I can't figure out the bug from just glancing at the code - all of the log properties in the file have more than one entry... so it seems something wrong in the logic in LoadNexusEvent.

[mducle]

Fixed in nightly 6.9.1.20240425.1854.

[GuiMacielPereira]

Reopening just to add that I suspect it was the work on #37141 that unintentionally fixed it