Split words in Cyrillic (Russian) texts

[dewyrise]

Device

X4

Affected Version

1.3.4, 1.4.0

EPUB Optimization

Yes, using the built-in web transfer EPUB optimizer

Cache State

Yes, book cache (Reader menu > Delete Book Cache)

Describe the Bug

In long paragraphs of Russian EPUBs some words are splitted and an indentation often added to the left side of the line. This behaviour appeared after the update to 1.3.4 and still persisted in 1.4.0. In 1.3.3 words aren't splitted, but an indentation still present in those long (more than 1200 symbols I think) paragraphs. These line indentations go away if you turn on extra paragraph spacing, but words stay splitted in 1.3.4-1.4.0 even after hyphenation is turned off. I cleared book cache every time after these changes to the page layout were made.

ch27_p6_38pct_137143.bmp
ch28_p3_39pct_321626.bmp
ch28_p6_40pct_340990.bmp

Steps to Reproduce

1. Open optimized EPUB in Russian with lengthy paragraphs.
2. Find one with more than 1000 symbols in it.

Nabokov Vladimir - Mashen'ka. Podvig.zip

Expected Behavior

In 1.3.4 and 1.4.0 FW an indentation inside the paragraph appears and a split word nearby. Sometime it's just an indentation, but in most cases they are both present.

Relevant Log Output/Screenshots