No she didn’t break any agreement.
The TW is disabled and was returning to FT work:
”The Respondents admit that the Claimant was disabled at all relevant times because of both of those matters and they admit that they knew she was at all relevant times.”
At the Occupational Health review it was noted
”She had not worked for several years and was also experiencing some anxieties about returning to the workforce and her hours of work.The OH advisor recommended meeting the Claimant before she started work to discuss any support that was required.”
“At their meeting on 12 May 2020, the Claimant asked if she could start work 15 hours per week and gradually build up her hours to full-time, because she had not been in employment for so long. Mr Swallow agreed to look into it, and it was subsequently agreed that she could build up to full-time over four weeks.”
She started work on 13 July. By 28 July she’d been the victim of two transphobic incidents and was put on excused absences by management as the investigations were done until going off sick from the stress on 13 Aug. She never had the chance to phase in to full time work at that location.