Hi,
There is no death index for Zalenze for this period and I wasn’t able to find one for Bogutschütz; I manually searched both USCs in 1911.
The only hit for the surname SCHUBERT is USC Zawodzie (in the USC district of Bogutschütz) no. 528/1911: Agnes ZMARSLY née SCHUBERT, miner cripple’s widow, 83 years old, living in Bogutschütz, born in Gleiwitz, daughter of Katharina SCHUBERT (last living in Bogutschütz, married to the master shoemaker PUDALLIK), died 12 December 1911.
There are plenty of other USCs in the area, unfortunately, that you should check – Kattowitz (Stadt), Kattowitz (Schloss), Hohenlohehütte, Domb, Siemianowitz, Laurahütte, Georgshütte, Schoppinitz, Rosdzin. Kattowitz (Stadt) and Siemianowitz had hospitals.
Kind regards,
Michael
Edit: For some of the USCs, indexes/records are on szukajwarchiwach, for others, there are indexes here: https://metryki.genealodzy.pl/woj-SL