Code block unsupported in block editor after update
After a WordPress update the highlighter block disappears from the block editor or shows as unsupported, so existing code posts cannot be edited.
Tier I · Proven The best-established problems.
5 public reports · first reported 15 August 2023 · last reported 21 April 2026
What's going wrong
Several site owners say the highlighter block stopped working after a WordPress core update, sometimes with a message that the site no longer supports the block.
AI-assisted: written with the help of AI from the reports. The idea report has the full summary.
In the idea report
- The full summary.
- The products the 5 reports are about, and how many came each month.
- Related problems.
No business has been found with this problem yet, so the report has no contacts. All sales are final — no refunds. Pricing.