Can easily be fixed in file: excel_xml_export.php

Replace lines 48 - 50 by (equal to the csv_export.php):

$t_page_number = 1;
$t_per_page = -1;
$t_bug_count = null;
$t_page_count = null;

IMO a workaround but not a fix.
Setting $p_per_page to -1 (get all bugs) might introduce memory issues.

I didn't have a deeper look, but maybe the real problem has been fixed.
Can you try 1.2.10 to check this or try the patch which is attached to 0013765 ?

I was not able to reproduce the behavior you described, either with 1.2.8 or latest git trunk. In both cases, the custom field comes fully populated for all records when I exported to Excel on my test environment.

If you are able to confirm this behavior, then please reopen this issue with detailed steps to reproduce it.

Dregad - the problem occurs with plugin columns, nog custom field columns. That's probably the reason why you can't reproduce it.

I did find that I fixed it incorrectly. The correct fix is even easier and very straightforward.

The code that caches plugin columns based on the resultset, must be placed inside the do-while loop:

pre-cache custom column data

columns_plugin_cache_issue_data( $result );

I'll see if I can create a pull request for this.

Sorry for misreading your initial post Vincent - indeed with plugin columns I can reproduce the problem. I'll commit a fix shortly.

Marking as 'acknowledged' not resolved/closed to track that change gets ported to master-2.0.x branch