I was trying to add a word to the internal word list with zG.  The
status line indicated that the word was added, but it remained
highlighted as a bad word.

Steps to reproduce

 1. $ cd ~/src/vim/vim # where latest clean build of Vim resides.
 2. $ VIMRUNTIME=runtime vim -N -u NONE -i NONE -c 'set spell'
 3. $ set spelloptions=camel
 4. Add a line with these words:
        Hello AB1234YZ world.
 5. Note that "AB1234YZ" is highlighted as a bad word.
 6. Move the cursor to 'A'.
 7. Type
        zG
 8. Note that a message like the following is displayed in the
    command/status line.
        Word 'AB1234' added to /tmp/v9NFArp/0
 9. Note also that that word remains highlighted as a bad word.
10. Move the cursor to the 'Y'.
11. Type
        zG
12. Note that a message like the following is displayed in the
    command/status line.
        Word 'YZ' added to /tmp/v9NFArp/0
13. Note also that 'YZ' is no longer highlighted as a bad word but
    'AB1234' still is.

Expected behavior

 I expect 'AB1234' to not be highlighted as a bad word.

 'AB1234' is not highlighted  as bad word if it appears in the text
 alone, but is highlighted when a some other word is appended, even
 a properly-spelled, capitalized word.

Version of Vim

 9.0.783

Environment

 Operating system:  Ubuntu 20.04
 Terminal:          Xterm(370)
 Value of $TERM:    xterm-256color
 Shell:             bash

Additional Context

 I don't know that this has ever worked.  I didn't try earlier
 versions with the 'spelloptions' option.  I just tried zG on
 a similar string--a processor part number--for the first time
 today.

Regards,
Gary

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