I was getting #24 with v0.6.1, but not anymore. Unfortunately I got a similar problem when I tried to update to v0.7.0.

Here's with v0.6.1:

error: invalid immediate, couldn't parse number (was: 30_2)
 --> .\add.asm:1:6
 |
...
5 | .ORIG x30_2
 | ^^^^^ invalid immediate here
 |

and with v0.7.0, removing the DisplayListFormatter and adding default FormatOptions to the snippet:

error: invalid immediate, couldn't parse number (was: 30_2)
 --> .\add.asm:1:11
 |
...
5 | .ORIG x30_2
 | ___________^
6 | | AND R1, R1, R1
 | |____^ invalid immediate here
 |

add.asm has 4 lines before that error, each ending in CRLF. It seems like the offset is in the other direction now.

Originally posted by @gipsond in #24 (comment)