Sending print to SL1s marked with "set ready and print now" via PrusaConnect results in error

[skellatore]

Description of the bug

When sending a file to a SL1s via Prusa Connect and PrusaSlicer 2.8.0+win64 utilising the "Set ready and print now" option, the file uploads correctly but then an error message is presented and the print is not started.

Error uploading to print host: HTTP 409: {"message": "Print start of the downloaded file from the print queue is not possible due to invalid printer state", "code": "CONFLICT_AFTER_DOWNLOAD_PRINT"}

Project file & How to reproduce

1. Slice a file for a SL1s
2. Send file to the SL1s via Prusa Connect with the "Set ready and print now"
3. File uploads correctly, but an error message is presented and print is not started

Checklist of files included above

• [ ] Project file
• [X] Screenshot

Version of PrusaSlicer

2.8.0+win64

Operating system

Windows 11

Printer model

SL1s 1.8.0-beta.0