This is most probably the result of a keyboard misconfiguration occurring in that update. Open System Settings > Keyboard (Keyboard pane). In its Text Input section, click on Edit for Input Sources to open a dialog with a list of keyboards at its left. Ensure All Input Sources is selected there, and the top item is enabled, to show the Input menu in the menu bar.
Then check the list of keyboards on the left of that dialog, to ensure it includes your preferred keyboard layouts. If not, click the “+” and add them from the list. Then click Done and select your preferred keyboard layout from those listed in the menu bar.