iOS 11 PDF viewer bug

Today I have downloaded iOS 11 on my iPhone and iPad and noticed a number of issues with PDF viewer:


i) Touching on the text does not always show the menu option. Same text can be selected when viewed on Mac and also this worked with previous iOS 9.3.5

ii) Selecting "Select All" option does not select all the text in the PDF document (it skips some lines/sentencens in between selected text. Also observed same behabior in iPad)