Stylistic variant of ച്ച and ള്ള does not form conjunct with ഉ in Mac
Attaching herewith, the screenshots of ച്ചു, ള്ളു in both variants took using Manjari and Gayathri fonts respectively. The text is typeset in pages of Mac. The base of the second variant of ള്ള shouldn't go that much down. The relative font size of that single glyph inside Gayathri is larger IMHO. These letters fail to form conjunct forms with U and UU vowels.