@jetland
Welcome to the HP Community Forum.
You are correct.
The Officejet Pro 8035 printer does not include 2-sided scan but does support 2-sided print.
Product Specifications for the HP OfficeJet Pro 8035 All-in-One Printer (3UC66A)
Section: Scan
Datasheet | HP OfficeJet Pro 8035 All-in-One Printer
Where to find information?
For example, 2-sided (single pass) scan is supported : HP Officejet Pro 9025 - Datasheet
So, your printer can scan two-sided but only if you go through the flip and repeat process.
How to Scan (Windows)
Printer Home Page - References and Resources – Learn about your Printer - Solve Problems
“Things that are your printer”
NOTE: Content depends on device type and Operating System
Categories: Alerts, Access to the Print and Scan Doctor (Windows), Warranty Check, HP Drivers / Software / Firmware Updates, How-to Videos, Bulletins/Notices, Lots of How-to Documents, Troubleshooting, User Guides / Manuals, Product Information (Specifications), more
When the website support page opens, Select (as available) a Category > Topic > Subtopic
HP OfficeJet Pro 8035 All-in-One Printer
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Dragon-Fur