setting breakindentopt via modeline brings E474

Hello,

I'm using vim 8.513 with +linebreak and have the following problem:

I want to set a modeline that does the following:

wrap long lines (set wrap) and break them at whitespace etc. (set linebreak). Indent the broken lines as far as the start of the line (set breakindent) and add 4 whitespace more (set breakindentopt=shift:4)

i tried the modeline

/* vim: set wrap linebreak breakindent breakindentopt=shift:4 : */

But I get the Error (re-translated from german:)

Error executing "modelines"
E474: invalid argument: breakindentopt=shift

If I enter the set command directly with

:set briopt=shift:4

all is fine and the indention is done as expected.

Am I doing something wrong in the modeline or did I just discover a bug?

greetings from Germany
ronald

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