Destination is /dev/null [ubuntu]

Describe the bug
Cups detects the network printer but configures a null address as the destination. Printing is not possible.

Screenshots

System Information:

• OS and its version: Ubuntu 26.04 LTS
• CUPS version: 2.4.16

Additional context

▎~
▎» lpstat -v
Gerät für Canon_TS5350i_series: implicitclass://Canon_TS5350i_series/
▎~
▎» lpstat -p
Drucker Canon_TS5350i_series druckt jetzt Canon_TS5350i_series-11.  Aktiviert seit Fr 14 Aug 2026 08:52:27 CEST
	ppdFilterEmitJCL: Filter function (PID 151139) started.
▎~
▎» sudo tail -50 /var/log/cups/error_log
[sudo: authenticate] Passwort:         
D [14/Aug/2026:08:52:23 +0200] [Job 11] envp[11]="TMPDIR=/var/spool/cups/tmp"
D [14/Aug/2026:08:52:23 +0200] [Job 11] envp[12]="USER=root"
D [14/Aug/2026:08:52:23 +0200] [Job 11] envp[13]="CUPS_MAX_MESSAGE=2047"
D [14/Aug/2026:08:52:23 +0200] [Job 11] envp[14]="CUPS_SERVER=/run/cups/cups.sock"
D [14/Aug/2026:08:52:23 +0200] [Job 11] envp[15]="CUPS_ENCRYPTION=IfRequested"
D [14/Aug/2026:08:52:23 +0200] [Job 11] envp[16]="IPP_PORT=631"
D [14/Aug/2026:08:52:23 +0200] [Job 11] envp[17]="CHARSET=utf-8"
D [14/Aug/2026:08:52:23 +0200] [Job 11] envp[18]="LANG=de_DE.UTF-8"
D [14/Aug/2026:08:52:23 +0200] [Job 11] envp[19]="PPD=/etc/cups/ppd/Canon_TS5350i_series.ppd"
D [14/Aug/2026:08:52:23 +0200] [Job 11] envp[20]="CONTENT_TYPE=application/vnd.cups-pdf-banner"
D [14/Aug/2026:08:52:23 +0200] [Job 11] envp[21]="DEVICE_URI=implicitclass://Canon_TS5350i_series/"
D [14/Aug/2026:08:52:23 +0200] [Job 11] envp[22]="PRINTER_INFO=Canon_TS5350i_series"
D [14/Aug/2026:08:52:23 +0200] [Job 11] envp[23]="PRINTER_LOCATION="
D [14/Aug/2026:08:52:23 +0200] [Job 11] envp[24]="PRINTER=Canon_TS5350i_series"
D [14/Aug/2026:08:52:23 +0200] [Job 11] envp[25]="PRINTER_STATE_REASONS=none"
D [14/Aug/2026:08:52:23 +0200] [Job 11] envp[26]="CUPS_FILETYPE=document"
D [14/Aug/2026:08:52:23 +0200] [Job 11] envp[27]="FINAL_CONTENT_TYPE=application/pdf"
D [14/Aug/2026:08:52:23 +0200] [Job 11] envp[28]="AUTH_I****"
D [14/Aug/2026:08:52:23 +0200] [Job 11] Started filter /usr/lib/cups/filter/bannertopdf (PID 150812)
D [14/Aug/2026:08:52:23 +0200] [Job 11] Started filter /usr/lib/cups/filter/pdftopdf (PID 150814)
D [14/Aug/2026:08:52:23 +0200] [Job 11] Started backend /usr/lib/cups/backend/implicitclass (PID 150815)
D [14/Aug/2026:08:52:23 +0200] [Job 11] ppdFilterLoadPPD: Color profile qualifier determined from job and PPD data \'RGB.Stationery.600dpi\'
D [14/Aug/2026:08:52:23 +0200] [Job 11] ppdFilterLoadPPD: No ICC profiles specified in PPD
D [14/Aug/2026:08:52:23 +0200] [Job 11] ppdFilterLoadPPD: Searching for profile \"-/Stationery\"...
D [14/Aug/2026:08:52:23 +0200] [Job 11] ppdFilterLoadPPD: Color profile qualifier determined from job and PPD data \'RGB.Stationery.600dpi\'
D [14/Aug/2026:08:52:23 +0200] [Job 11] ppdFilterLoadPPD: No ICC profiles specified in PPD
D [14/Aug/2026:08:52:23 +0200] [Job 11] ppdFilterLoadPPD: Searching for profile \"-/Stationery\"...
D [14/Aug/2026:08:52:23 +0200] [Job 11] ppdFilterLoadPPD: Last filter determined by the PPD: -; Final data MIME type: application/pdf => PDF filter will log pages in page_log.
D [14/Aug/2026:08:52:23 +0200] [Job 11] ppdFilterLoadPPD: Last filter determined by the PPD: -; Final data MIME type: application/pdf => PDF filter will log pages in page_log.
D [14/Aug/2026:08:52:23 +0200] [Job 11] Read cups-browsed-dest-printer option: \"11 NO_DEST_FOUND\"
D [14/Aug/2026:08:52:23 +0200] [Job 11] Set job-printer-state-message to "No suitable destination host found by cups-browsed, retrying later", current level=ERROR
D [14/Aug/2026:08:52:23 +0200] [Job 11] cfFilterBannerToPDF: Copying input to temp file \"/tmp/24d1c6a8b45fe\"
D [14/Aug/2026:08:52:23 +0200] [Job 11] ppdFilterEmitJCL: Filter function (PID 150818) started.
D [14/Aug/2026:08:52:23 +0200] [Job 11] cfFilterPDFToPDF: Forced page logging selected by options.
D [14/Aug/2026:08:52:23 +0200] [Job 11] PID 150812 (/usr/lib/cups/filter/bannertopdf) exited with no errors.
D [14/Aug/2026:08:52:23 +0200] [Job 11] cfFilterPDFToPDF: Processing PDF input with QPDF: Page-ranges, page-set, number-up, booklet, size adjustment, ...
D [14/Aug/2026:08:52:23 +0200] [Job 11] cfFilterPDFToPDF: \"print-scaling\" IPP attribute: auto
D [14/Aug/2026:08:52:23 +0200] [Job 11] cfFilterPDFToPDF: Print scaling mode: Do not scale, center, crop if needed
D [14/Aug/2026:08:52:23 +0200] [Job 11] cfFilterPDFToPDF: After Cropping: 595.275574 841.889771 595.275574 841.889771
D [14/Aug/2026:08:52:23 +0200] [Job 11] PAGE: 1 1
D [14/Aug/2026:08:52:23 +0200] [Job 11] ppdFilterEmitJCL: Filter function (PID 150818) exited with no errors.
D [14/Aug/2026:08:52:23 +0200] [Job 11] PID 150814 (/usr/lib/cups/filter/pdftopdf) exited with no errors.
D [14/Aug/2026:08:52:23 +0200] [Job 11] PID 150815 (/usr/lib/cups/backend/implicitclass) stopped with status 7.
D [14/Aug/2026:08:52:23 +0200] [Job 11] Hint: Try setting the LogLevel to "debug" to find out more.
D [14/Aug/2026:08:52:23 +0200] [Job 11] Retrying job on same printer.
D [14/Aug/2026:08:52:23 +0200] [Job 11] End of messages
D [14/Aug/2026:08:52:23 +0200] [Job 11] printer-state=3(idle)
D [14/Aug/2026:08:52:23 +0200] [Job 11] printer-state-message="ppdFilterEmitJCL: Filter function (PID 150818) started."
D [14/Aug/2026:08:52:23 +0200] [Job 11] printer-state-reasons=none
E [14/Aug/2026:08:52:23 +0200] [Job 11] No suitable destination host found by cups-browsed, retrying later

Start by tracing how cups-browsed creates the implicitclass:// queue and how the implicitclass backend resolves destinations. Reproduce the failure with the reported lpstat output and the NO_DEST_FOUND/status 7 log entries. Done means the detected printer receives a valid destination and printing no longer retries with a null address.