Block used in Multileader wont let drawing save

[seanp.fahey]

We use a custom user block that is added to Multileaders for Erosion Control to meet standards from several entities.  We have successfully used this block in the past with no issues.  This error has now appeared in the past week.  See below screencast.

https://autode.sk/3ats1sR

We as a company are using Civil 3D 2018.2.  I am a little ahead and have Civil 3D 2018.3 and Civil 3D 2020.2.  Anytime this block is used in a drawing the drawing will not save, won't even allow the drawing to close.  Prompting the following message:

Object(s) added to DB too late during save. Handles 26DDF to 26DDF
26DDF: type AcDbRegAppTableRecord, owner 9 (AcDbRegAppTable)

I have tried starting with a fresh drawing and recreated the block to no avail.  The drawing can be saved upon removal of the offending multi-leader, but any multi-leader with the user block (attached) causes an issue.  I have tried doing this in Civil 3D 2018 and 2020, also to no success.  I have also tried doing the normal -purge, purge and Audits.

If the forum has any other ideas, I am up for them.

Thank you

Sean

[tcorey]

Can you share the drawing?

[seanp.fahey]

There is no specific drawing this is the issue in.  Multiple new drawings and templates have this issue.  

[cwr-pae]

Tim was asking if you can share a drawing with the block, maybe the source drawing and a drawing that wont save. Then maybe someone can determine if it is the block, the file template or something else and a possible solution.

[seanp.fahey]

My apologies, I thought I had added the block dwg to the original post.

[Joe-Bouza · Accepted solution]

I can save a drawing with the bock but had a lag of 10-15 seconds

Strange. I do not why it is,.  I redefined your block methodically

When I use a non multiline attribute that are non annotative the drawing save instantly.

The mleader is annotative so its redundant.

I do recall years ago Multiline attribute having issues but I havent encountered recently.

either way , my suggestion is 

non annotative

lock position

no multiline

in the attribute definitions

[seanp.fahey]

Joe,

Thank you for the solution, that did the trick.  I still needed a mask, so I used a wipeout around the attributes.

Sean