25300 not working in 2024 Standard Desktop version

https://www.canada.ca/en/revenue-agency/services/tax/individuals/topics/about-your-tax-return/tax-re...

 

The above link clearly outlines the use of line 25300 in the case where the taxpayer does not have pre-1985 loss records.  My case. 

However, when I double-click on line 25300, I am taken to a field in the Loss worksheet requiring a pre-1985 amount of unapplied losses!  Why??  I cannot get past this roadblock.  The best I can do as a workaround,  is to enter the pre-1985 amount - but then I am only allowed to claim $2000.

In searching for related posts - one suggested clearing out the data and doing it again.  I opened a new Tax return with no data, added a T5008 slip and tried to claim line 25300 and still had the same issue.

BTW - is this post getting through to TurboTax support?   I cannot tell from the web site which does not make a method for raising a support issue clear.

What do I need to do to get a answer?