Comparators don't detect flowing items

When some hoppers are making a way down, as on the screenshot, if any item is thrown in the hopper on top, this item will travel down too fast and the comparator is not able to detect the items flowing through.
the only way to detect the items is to put more than 3 items, at the same times (no one by one) in the hopper where the comparator is.

Code analysis: https://bugs.mojang.com/browse/MC-75571?focusedCommentId=285109&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-285109