Adjust md_in_html "markdown" blocks to process content consistently
#867
| Job | Run time |
|---|---|
| 7s | |
| 31s | |
| 10s | |
| 26s | |
| 17s | |
| 25s | |
| 45s | |
| 26s | |
| 28s | |
| 1m 19s | |
| 1m 8s | |
| 1m 10s | |
| 23s | |
| 7m 35s |