existing posts with page.summary went wrong after update to 1.3.3

[tidiview]

After updated to 1.3.3, exisiting posts with page.summary function went wrong for me: it has been now cutting before === page summary delimiter: please find details below.

This is due to version 1.3.3 CHANGELOG here

New page.summary now cut at === delimiter BUT with count HTML tags so that it's now too short for me.

Removing the following part of 1.3.3 code by previous version 1.3.2 solved the issue:
line 522 of \system\src\Grav\Common\Page\Page.php

if (mb_strwidth($content, 'utf8') > $summary_size) {
                return mb_strimwidth($content, 0, $summary_size);
            } else {
                return $content;}           

by

return mb_substr($content, 0, $summary_size);

Sorry, I don't have sufficient technical php skills: please, help.

Here the structure of my .md file for more information:

some header with parameters:
summary:
    enabled: true
    format: short
    size: 0
---

! わたしたちが今日ふつう「女大学」と呼んでいるのは、
! この書の本文を受けついで編まれた教順書類である。<---This is page summary in japanese  

===  <--- This is page summary delimiter

##概要 <--- This is rest of page content in japanese

[rhukster]

I will look into this tomorrow.

[tidiview]

Thanks. I'll have a look tomorrow then

[rhukster]

Please try the fix above.