Apologies in advance if you're aware of this already, I was unable to locate anything outside of a 2017 thread in the feedback forum calling out the Staff of the Woodlands specifically for not showing concentration.
If a concentration spell is included as a spell charge in an item, the description under the "Gear" section does not show if the spell requires concentration or not. In addition to the Staff of the Woodlands, I've checked the Staff of Power, Staff of Fire as well as Necklace of Prayer Beads and none of them are showing Concentration under the Gear section of the character sheet.
Apologies in advance if you're aware of this already, I was unable to locate anything outside of a 2017 thread in the feedback forum calling out the Staff of the Woodlands specifically for not showing concentration.
If a concentration spell is included as a spell charge in an item, the description under the "Gear" section does not show if the spell requires concentration or not. In addition to the Staff of the Woodlands, I've checked the Staff of Power, Staff of Fire as well as Necklace of Prayer Beads and none of them are showing Concentration under the Gear section of the character sheet.