Does it work, if you change line 189 in file .../plugins/MantisGraph/MantisGraph.php
from
printf( "\t<script src=\"%s\"></script>\n",
to
printf( "\t<script type=\"text/javascript\" src=\"%s\"></script>\n",

Thanks atrol, it worked!

I don't know why "script type=\"text/javascript\"" is required to work in Apple Safari, is it not implied?

As far as I know, Safari 16.3 fully support HTML5 =/

Using Safari 16.4 on my macbook, I have no difficulties viewing Graphs on this tracker or on a local fresh install, without having to change the source code.

I was also not able to reproduce using Safari 16.4,

I have no difficulties viewing Graphs on this tracker

@dregad we have $g_cdn_enabled = ON; on this tracker, I guess @devnull that adding this line to your config_inc.php would also solve your issue.

@dregad we use text/javascript in other places in code, e.g. html_javascript_cdn_link.
Do you agree, that we should do it the same way in whole code?

Opened PR for it https://github.com/mantisbt/mantisbt/pull/1884

we have $g_cdn_enabled = ON; on this tracker

I have it OFF on my dev box, yet graphs are displayed correctly.

we use text/javascript in other places in code, e.g. html_javascript_cdn_link.
Do you agree, that we should do it the same way in whole code?

I suppose it does not hurt to add it, but I'd like to understand why it's working for you me without it, and not for @devnull.

but I'd like to understand why it's working for you me without it ...

Same for me, at the moment I see just Safari 16.3 vs. Safari 16.4
@devnull are you able to upgrade to Safari 16.4?